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y ,G-.R. PEA-RB. -Boot-and Sho'e Sewing Machines. No. 235,377. PatentedDec. 14V, 1880.

Fiyi MPETERS. PHO10-LITMOGHFIIER| WASHINGTON. D. (I4

UNITED STATES PATENT FEICE.

GEORGE R.' PEARE, OF LYNN, MASSACHUSETTS, ASSIGNOR TO HIMSELF, AARON `F.SMITH, AND GEO. W. HOYT, OF SAME PLAGE.

BOOT AND SHOE SEWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 235,377, dated December14 1880.

Application filed J' une 26, 1880.

To all whom it may concern Beit known that I, GEORGE It. PEARE, of Lynn,of the county otEssex and State of Massachusetts, have invented a newand useful Improvement in Boot and Shoe Sewing Machines; an d I dohereby declare the same to be described in the following specificationand represented in the accompanying drawings, of which- Figure l is aside elevation of the horn of a KcKay sewing-machine with mythread-tension 'regulator applied thereto. Fig. 2 is a transversesection of such and the thread-waxer, such section showing my improvedarrangement of the thread-stripper relatively to the lower guide and theguide-roll to and from which the thread is led from the waxer to thetension-regulator. Fig. 3 is a top view, and Fig. 4 an edge view, ofthethread-stripper, to be described. Fig. is a top view of the mechanism tobe described, excepting the inclined part of the arm A, as hereinafterexplained. Fig. 6 is an enlarged sectional view of the tension-wheel andits frictional devices, it being taken through the axis of the shaft orspindle thereof.

The nature of my invention is fully set forth in the claims hereinafterpresented.

The object of the tension-regulator, which I have combined with theMcKay sewing-machine, or the horn thereof, is to cause the waxed threadto be delivered to the looper or wheel with a uniformity of tension.

It is well known to those who are skilled in the use of the McKaysewing-machine that from various causes the tension of the thread is aptto vary more or less, whereby the sewin g is effected disadvantageously.I have therefore added to the said machine a mechanism to regulate thetension of the thread or keep such uniform; and, furthermore, I havearranged the thread-stripper of the waxer so that the thread, on passingthrough such stripper,` does so at a right angle, or thereabout, to itsjaws, whereby the thread becomes uniformly waxed around it. Thethread-stripper I have so made as to enable the thread to be readilypassed in between the jaws or removed therefrom, as occasion'mayrequire.

In the said drawings, A denotes the horn or (N o model.)

boot or shoe holding arm of a McKay sewingmachine, the base or lowerportion, c, of such horn being fixed to a vertical shaft, b, so as to berevolublewith suoli.

Resting on and secured by screws c to the cap-plate d of the hollowportion a of the horn is the sustaining-frame e of the tensionregulator.In this frame there is fulcrumed a furcated lever, B, having at thetermination of its longer arm a journal, f, to receive and support agrooved guide-wheel, C. The fulcrum of the lever is shown at g as havinga bearing in a standard, h, of the frame c. From the said standard ajournal, z', projects and supports a guide-wheel, k, arranged upon it,as shown.

A spring, D, formed as represented, and which should be properlysupported, has one arm, l, resting on the longer arm ofthe lever B, or astud projecting therefrom. The shorter arm m of the spring is turned upand inserted in a socket at the lower part of a screw, n, which screwsthrough apost, o, there being upon the screw a set-nut, lo.

There extends up from the shaft b a spindle, q, which is arrangedbetween the prongs of the lever B. A disk, r, supported on the saidprongs, slides freely ou the spindle q, and is arranged concentricallythereon. On the disk is a washer, s, of leather or other propermaterial, on which rests the tension-wheel E, formed as shown.

From the top of the hub of the tension-wheel two short standards, t, areextended, as represented. A plate, u, slides vertically on the saidstandards and on the spindle, the standards serving to cause such plateto revolve on the spindle with the tension-wheel. A washer, c, is placed011 the spindle and plate u, another such washer, o, being similarlyarranged underneath the plate u, and upon a metallic disk, w, that isfree to slide vertically on the spindle, but not to revolve thereon.There is between the disk w and the hub ot' the tension-wheel anotherwasher, a'. A rnetallic disk, y, resting on the upper washer, fn, andadapted to the spindle so as to slide vertically, but not to revolveupon it, is forced downward by a helical spring, z, encompassing thespindle, and arranged under a nut, a',

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which is screwed on the spindle and against the upper part of thespring.

By means of the said nut and the screw b ofthe spindle, and also bymeans of the washers v v, the plate u, the metallic disks 1r and y, andthe washer x, and the disk r, applied to the spindle and thetension-wheel,asdescribed, the said wheel is not only caused to berevolved with friction by the thread, but such friction may be increasedby setting down the nut on its screw, and be diminished by turning thenut the opposite way.

The thread is shown at c' as passing from the reservoir ll' of the waxerbetween thejaws ef ofthe stripper F, thence to and partly around theguide-wheel lr, thence into the groove d2 of the tension-wheel Il,thence partly around such wheel, thence to and partly around the groovedperiphery of the wheel C, and thence up to the upper part of the hornand into and through the looper or wheel thereof in the usual manner,and to the needle'c.

The stripper has itsjaws arranged at right angles, or substantially so,to the part of the thread which is between the wheel l.' and thatthread-guide f2 at theI bottom of the wax-reservoir from which thethread passes directly to the jaws.

The lowerjaw, e', of the stripper l is tixed to an inclined standard,g', which is formed with an opening to receive the upper-jaw carrier,h', which, at its upper part, is pivoted to the standard y'. The jaw fis adapted to the carrier l'z',so as to slide lengthwise thereon, andhas applied to it and the standard a screw, yi', in manner to enable thejaw,by such screw,to be moved either toward or away from its fellow jaw.A spring, lr', properly fixed to the standard and to the upper-jawcarrier, forces the latter down to place to bring the upper of the jawsinto proper relation to the lower of them. Should there be a knot in thethread, whereby the passage ofthe thread between the jaws would beobstructed, the upper-jaw carrier, with its jaw, by the pressure of theknot,would be drawn upward relatively to the lower jaw, in order for theknot to pass the jaws.

In the standard g', opposite the bite ot' the jaws,and leadingontot'such standard in manner as shown, is a passage, I', through which thethread can readily bc passed to and from the bite of the jaws,thussaving the necessity of passing an implement or hook between the jawsand seizing the thread and drawing it between them, as usuallyheretofore done.

Should the draft or tension on the thread increase beyond the amountrequired, the lever B will be moved so as to cause the friction on thetension-wheel E to be accordinglydiminished, and thus equality oftension will be secured by my regulator, the tension-regulator abovedescribed operatingautomatically, whereby itdiffers essentially fromthat shown in the United States Iatent No.229,049,whose lever,instead ofbeing operated by the thread, has to be by the hand of an attendant. Mythread-tension regulator also diters, both in construction andoperation, from that shown in the United States Patent No. 27,948,though each has a lever to be moved by the draft of the thread. In mymechanism there is the adjustingscrew n to revolve on the spring, andthere is to such l screw and its supporting-standard o a set-nut, p,there being no such application of a screw anda set-nut in eitherofthemechanisms shown in the said patents.

Furthermore, it will be seen that with my improvement the wheel E isdisposed over or near the shaft b, and the lever B is extended towardand has its longer arm terminating in close proximity with the inclinedpart of the horn A. By this arrangement the wheel E and its frictiondevices are carried so far from the inclined part of the arm as to beentirely out of the way of a boot-leg when encompassing the arm.

What I claim as of my invention may be stated as follows, viz:

l. The combination of the sewing-machine rotary arm or horn A with theautomatic threadtension apparatus, substantially as described,consisting ofthe grooved wheel E, its friction apparatus, the lever B,spring D, guide-wheel C, adjusting-screw u, clamp-nntp, and stainlard o,arranged with its wheel E over or in close proximity with the shaft b ofthe said horn, and with the longer arm of the lever B or its guidewheel(J in close proximity with the inner side of the inclined portion of thehorn A, all heilig essentially and to operate as set forth.

2. The combination of the screw n and setnut p with the standard o, thespring,r I), lever B, and tension-wheel E, the latter beingr providedwith friction apparatns, and all being to operate substantially as setforth.

3. The stripper, inclined standard, and lowerjaw carrier y', providedwith the lateral passage l', in combination with thelowerjaw,and withthe upper jaw and its adjusting-screw and carrier, arranged and appliedsubstatitially as set forth.

4. The automatic tension-regulator, substantially as described,consisting of the grooved wheel E, its friction apparatus, the lever B,spring l) and guide-wheel C, adjusting-screw n, clamp nut p, andstandard o, all being adapted and to operate essentially as set forth.

GEORGE R. PEARE.

'itnesses lt. H. EDDY, W. W. LUNT.

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